I have a query that returns several hundred rows and enough columns that a horizontal scroll bar shows up in the results.
If I do the query then press ctrl-end, it takes me to the last column on the last row. This is fine. If I hold the left-arrow key, it scrolls the results back to the first column of the last row. This is fine.
If I do the query then press ctrl-end then use the horizontal scroll bar to go to the first column, TWS crashes. I think I've only seen this when I have a query that shows fields that get resized. Like when TWS sees that a field has more text than can fit in the current column width and tries to resize it.